材料科学
复合数
碳化
化学工程
无定形碳
无定形固体
碳纤维
阳极
纳米颗粒
喷雾干燥
石墨
纳米技术
电极
复合材料
扫描电子显微镜
化学
有机化学
物理化学
工程类
作者
Su Hyun Yang,Jin Koo Kim,Dae-Soo Jung,Yun Chan Kang
标识
DOI:10.1016/j.apsusc.2022.154799
摘要
Silicon-nanoparticle-embedded amorphous carbon-graphitic carbon composite microspheres (denoted as Si/[email protected]) with numerous empty voids are synthesized using a spray drying process. Spray dried composite microspheres consisting of Si nanopowders, dextrin, and iron salt are transformed to uniquely structured Si/[email protected] microspheres via one-step carbonization followed by acid etching. The in situ formation of graphitic carbon with high electrical conductivity within the Si-C composite at a low carbonization temperature (700 °C) is achieved by applying a metallic Fe nanocatalyst. The Si/[email protected] microspheres exhibit higher electrochemical properties than bare Si nanopowders and Si/amorphous carbon composite microspheres (denoted as Si/AC) with filled structures. The synergistic effects of structural merits owing to the spherical morphology with empty nanovoids for liquid electrolyte penetration and a graphitic carbon layer with high electrical conductivity result in the superior lithium-ion storage performances of Si/[email protected] microsphere. The composite-based electrode delivers a high reversible capacity of 803 mA h g−1 after 200 cycles at 1.0 A g−1, indicating long-term cycling stability. Even at 5.0 A g−1, the electrode exhibits stable reversible discharge capacity of 589 mA h g−1 without significant capacity loss.
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